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Fair Value Measurements - Carrying Amounts and Estimated Fair Values by Input Level (Details) - USD ($)
$ in Millions
Mar. 31, 2023
Dec. 31, 2022
Jul. 01, 2021
May 31, 2020
Jan. 19, 2017
Financial assets:          
Equity securities $ 13.9 $ 17.1      
Senior Notes | 5.625% Notes          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Interest rate 5.625% 5.625%     5.625%
Senior Notes | 4.125% Notes due 2029          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Interest rate 4.125% 4.125% 4.125%    
Convertible Notes | 2.75% Convertible Notes due 2026          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Interest rate 2.75%     2.75%  
Recurring | Level 1          
Financial assets:          
Cash and cash equivalents $ 1,311.3 $ 1,624.0      
Equity securities 0.0 0.0      
Held-to-maturity securities 0.0 0.0      
Promissory notes 0.0 0.0      
Financial liabilities:          
Other liabilities 0.0 0.0      
Derivative asset        
Recurring | Level 1 | Amended Credit Facilities          
Financial liabilities:          
Long-term debt 1,515.3 1,514.7      
Recurring | Level 1 | Senior Notes | 5.625% Notes          
Financial liabilities:          
Long-term debt 373.0 371.0      
Recurring | Level 1 | Senior Notes | 4.125% Notes due 2029          
Financial liabilities:          
Long-term debt 330.0 327.0      
Recurring | Level 1 | Convertible Notes | 2.75% Convertible Notes due 2026          
Financial liabilities:          
Long-term debt 473.7 550.8      
Recurring | Level 1 | Other long-term obligations          
Financial liabilities:          
Long-term debt 0.0 0.0      
Recurring | Level 2          
Financial assets:          
Cash and cash equivalents 0.0 0.0      
Equity securities 13.9 17.1      
Held-to-maturity securities 6.7 6.7      
Promissory notes 7.9 7.9      
Financial liabilities:          
Other liabilities 2.7 2.4      
Derivative asset   0.4      
Recurring | Level 2 | Amended Credit Facilities          
Financial liabilities:          
Long-term debt 0.0 0.0      
Recurring | Level 2 | Senior Notes | 5.625% Notes          
Financial liabilities:          
Long-term debt 0.0 0.0      
Recurring | Level 2 | Senior Notes | 4.125% Notes due 2029          
Financial liabilities:          
Long-term debt 0.0 0.0      
Recurring | Level 2 | Convertible Notes | 2.75% Convertible Notes due 2026          
Financial liabilities:          
Long-term debt 0.0 0.0      
Recurring | Level 2 | Other long-term obligations          
Financial liabilities:          
Long-term debt 35.9 36.4      
Recurring | Level 3          
Financial assets:          
Cash and cash equivalents 0.0 0.0      
Equity securities 0.0 0.0      
Held-to-maturity securities 0.0 0.0      
Promissory notes 0.0 0.0      
Financial liabilities:          
Other liabilities 7.4 7.2      
Derivative asset   0.0      
Recurring | Level 3 | Amended Credit Facilities          
Financial liabilities:          
Long-term debt 0.0 0.0      
Recurring | Level 3 | Senior Notes | 5.625% Notes          
Financial liabilities:          
Long-term debt 0.0 0.0      
Recurring | Level 3 | Senior Notes | 4.125% Notes due 2029          
Financial liabilities:          
Long-term debt 0.0 0.0      
Recurring | Level 3 | Convertible Notes | 2.75% Convertible Notes due 2026          
Financial liabilities:          
Long-term debt 0.0 0.0      
Recurring | Level 3 | Other long-term obligations          
Financial liabilities:          
Long-term debt 126.2 118.0      
Recurring | Carrying Amount          
Financial assets:          
Cash and cash equivalents 1,311.3 1,624.0      
Equity securities 13.9 17.1      
Held-to-maturity securities 6.7 6.7      
Promissory notes 7.9 7.9      
Financial liabilities:          
Other liabilities 10.2 9.9      
Derivative asset   0.4      
Recurring | Carrying Amount | Amended Credit Facilities          
Financial liabilities:          
Long-term debt 1,495.6 1,503.6      
Recurring | Carrying Amount | Senior Notes | 5.625% Notes          
Financial liabilities:          
Long-term debt 399.7 399.7      
Recurring | Carrying Amount | Senior Notes | 4.125% Notes due 2029          
Financial liabilities:          
Long-term debt 394.0 393.8      
Recurring | Carrying Amount | Convertible Notes | 2.75% Convertible Notes due 2026          
Financial liabilities:          
Long-term debt 324.8 324.3      
Recurring | Carrying Amount | Other long-term obligations          
Financial liabilities:          
Long-term debt 163.5 156.1      
Recurring | Fair Value          
Financial assets:          
Cash and cash equivalents 1,311.3 1,624.0      
Equity securities 13.9 17.1      
Held-to-maturity securities 6.7 6.7      
Promissory notes 7.9 7.9      
Financial liabilities:          
Other liabilities 10.1 9.6      
Derivative asset   0.4      
Recurring | Fair Value | Amended Credit Facilities          
Financial liabilities:          
Long-term debt 1,515.3 1,514.7      
Recurring | Fair Value | Senior Notes | 5.625% Notes          
Financial liabilities:          
Long-term debt 373.0 371.0      
Recurring | Fair Value | Senior Notes | 4.125% Notes due 2029          
Financial liabilities:          
Long-term debt 330.0 327.0      
Recurring | Fair Value | Convertible Notes | 2.75% Convertible Notes due 2026          
Financial liabilities:          
Long-term debt 473.7 550.8      
Recurring | Fair Value | Other long-term obligations          
Financial liabilities:          
Long-term debt $ 162.1 $ 154.4